CHARACTERIZATION OF THE COAL ASH BEHAVIORS UNDER HIGH TEMPERATURE

摘要

Coal ash is the main product of mineral matters in coal during the utilizations. The coal ash causes a lot of problems during combustion and gasification. The deposits on heat transfer surfaces are affecting the heat transfer intensity and leading to unexpected shutdowns as well as decreasing the lifetime of the equipments[1,2]. And also the ash particles which emitted around have a serious adverse health effect for human [3,4,5], so the understanding of the behaviors of coal ash is the basis for effective and clean coal utilization. Huffman eta [6] studied relations between ash melting behavior and mineral matter transformation under oxidizing and reducing atmospheres. They found that the ash melting temperature was much lower than the initial deformation temperature and the ash melting behavior was controlled by iron rich corner in a reducing atmosphere. The ashes generated from three coals were mixed by different ratios to predict the ash behaviors of blend coal mines, and the mineral.